• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Current Science: A Fortnightly Journal of Research >Understanding relationship between melt/freeze conditions derived from spaceborne scatterometer and field observations at Larsemann Hills, East Antarctica during austral summer 2015-16
【24h】

Understanding relationship between melt/freeze conditions derived from spaceborne scatterometer and field observations at Larsemann Hills, East Antarctica during austral summer 2015-16

机译：2015 - 16年南部南部南极洲山区散散仪和野外观测融合/冻结条件之间的关系

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Snow fork and ground penetrating radar at 200 MHz were used for snow depth, wetness and density measurements towards understanding the relationship between melt/freeze conditions derived from spaceborne Advance Scatterometer (ASCAT) and Oceansat-2 Scatterometer (OSCAT), and field observations. The observations were acquired at Larsemann Hills, East Antarctica in austral summer of 2015-16 during the 35th Indian Scientific Expedition to Antarctica. The field observations of wetness correlated well with identified dry and percolation zones showcasing different behaviours of density and wetness. Ice firn was observed at 50-55 cm depth, even in dry zone. Melt onset and number of melt days based on ASCAT varied spatially and temporally over the years and correlated well with positive degree day (PDD) for automatic weather station data located at the Indian Antarctic station, Bharati. Backscatter measurements by OSCAT showed that winter backscatter reduced with accumulation for both dry and percolation zones, but increased in the later part of winter in the percolation zone. A positive but low correlation was observed between ASCAT backscatter to accumulation and the surface mass balance from regional atmospheric climate model (RACMO2.3). A high correlation of 0.78 was observed between reduction in backscatter due to liquid water content and PDD, which coincides with field observations of wetness. The observations serve as baseline to monitor melt conditions and stability of existing ice sheet.
机译：200 MHz的雪叉和地面穿透雷达用于雪深，湿度和密度测量来了解从太空出生的散射计（Accat）和Oceansat-2散射仪（OSCAT）和现场观测的熔体/冻结条件之间的关系。在第35-16届印度科学探险到南极洲，在2015 - 16年南部的东南部，在南部南极洲的拉斯蒙南山上获得了观察。湿度的田间观察与透析密度和湿度不同的不同行为的鉴定的干燥和渗透区相关。即使在干燥区域，也观察到冰Firn在50-55厘米的深度。熔体发作和基于ASCAT的熔体天数在空间和时间上变化，多年来，与位于印度南极站，Bharati的自动气象站数据有关的正面（PDD）相关。 OSCAT的反向散射测量显示，冬季反向散射随着干燥和渗滤区的积累而减少，但在渗透区的冬季后部部分增加。在ASCAT反向散射之间观察到积极但低的相关性，从区域大气气候模型（RACMO2.3）积累和表面质量平衡。由于液体含水量和PDD，在后散射的降低之间观察到0.78的高相关性，这与湿度的场观察一致。观察结果用作监测现有冰盖的熔体条件和稳定性的基线。

著录项

相似文献

  • 外文文献
  • 中文文献
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号